While investigating the energy plant in Pasadena, a ghost locks Mack in a holding chamber and is about to kill Fitz when Robbie arrives. He quickly transforms into Ghost Rider and incinerates the ghost. Daisy runs in and quakes Mack out of the chamber with seconds to spare. From Marvel's Agents of S.H.I.E.L.D. Season 4, Episode 2, "Meet the New Boss." Watch all-new episodes TUESDAYS at 10|9c on ABC.